devincapriola/A2SPA_The_Missing_Security_Layer_for_AI_Agents

Agent-to-Secure Payload Authorization | Get Started | Documentation

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The Problem

Every major AI agent framework today — LangChain, AutoGen, CrewAI, MCP, AWS Bedrock — treats incoming payloads as legitimate by default.

Orchestration routes them. Tool schemas validate their shape. Sandboxing contains execution. Guardrails check the output. But nobody cryptographically verifies that a payload was:

• Actually sent by the agent who claims to have sent it
• Unmodified in transit
• Not replayed from a previous session
• Authorized to be sent by that agent

This is the Payload Trust Gap — and it's what enables every serious agent exploit including prompt injection, agent hijacking, and replay attacks.

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What A2SPA Does

A2SPA is a cryptographic control layer that sits at the execution boundary of your agent stack (Layer 5 — between orchestration and execution) and enforces verification on every single payload before it runs.

Orchestration Layer
      ↓
  Tool Schemas
      ↓
  Sandboxing
      ↓
  Permissions
      ↓
  Guardrails
      ↓
  Logging
      ↓
━━━━━━━━━━━━━━━━━━━━━━━━━
  PAYLOAD TRUST GAP  ⚠️
  (all layers above assume
   the payload is legitimate)
━━━━━━━━━━━━━━━━━━━━━━━━━
      ↓
┌─────────────────────┐
│  A2SPA CONTROL      │
│  LAYER              │
│  Sign → Verify →    │
│  Log                │
└─────────────────────┘
      ↓
  EXECUTION BOUNDARY
  (Arms, Drones, Wallets,
   Tools, Robots)

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Features

Feature	Description
🔐 Cryptographic Signatures	Every payload SHA-256 hashed and signed with the agent's private key
🔄 Nonce Replay Protection	Unique nonce per request with 24-hour TTL storage
🔒 Agent Permission Mapping	Granular per-agent send/receive control with instant ON/OFF toggle
✅ Identity Binding	Every action tied to a verified agent identity, not just an API key
📋 Tamper-proof Audit Trail	Complete interaction logging with CSV export
📊 ROI Tracking	Time saved and dollar value generated per agent

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How It Compares

Security Feature	A2SPA	MCP	A2A	ACP	ANP	LangChain	AWS Bedrock
Payload Signing	✅	❌	❌	❌	❌	❌	❌
Nonce/Replay Protection	✅	❌	❌	❌	❌	❌	❌
Permission Mapping	✅	❌	❌	❌	✅	❌	❌
Audit Logging	✅	❌	❌	❌	❌	❌	❌
Zero-Trust Ready	✅	❌	❌	❌	❌	❌	❌

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What A2SPA Enforces on Every Payload

Authenticity — The payload was signed with the sending agent's private key. SHA-256 hash + signature verification on every request.

Authorization — The sending agent has permission to send this type of payload. Granular per-agent permission mapping with instant on/off toggle.

Non-repudiation — Tamper-proof record that this specific agent sent this specific payload at this specific time.

Integrity — Any modification in transit invalidates the signature.

Replay Protection — Unique nonce with 24-hour TTL. A captured payload cannot be replayed.

Identity Binding — Every action tied to a verified agent identity, not just a session token.

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Pricing

$0.01 per verification — pay-as-you-go, no minimums, no upfront commitment.

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Framework Compatibility

A2SPA is framework-agnostic. It works with any agent framework including LangChain, AutoGen, CrewAI, and custom implementations.

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Get Started

👉 aimodularity.com/A2SPA

• Documentation

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About

A2SPA was invented by Jonathan, Devin & Gavin Capriola. Patent pending.

The cryptographic firewall for AI agents.